The first post in this thread has a list of available (and planned) cases with camera control (CC) buttons.
There is no consensus because each person has different needs/priorities. Here are a few thoughts:
If you can live with silicone as a case material, the Apple Silicone has arguably the best CC button and overall fit.
If you don’t mind clear cases, the Spigen Ultra Hybrid T has a very good CC button, good fit, and is a great value if purchased from Spigen’s eBay store.
The Otterbox Lumen, which is also a clear case, has an equally good CC button, much better buttons all around, but is more of a fingerprint magnet and more expensive than the Spigen UHT.
The Spigen Tough Armor T AI is arguably the best heavy duty case with a CC button.
Supcase, I-Blason, and other off brands on Amazon use copper rods for conductivity in their CC buttons. These buttons don’t work as well as the buttons that use printed circuit boards (Apple, Spigen, Otterbox). DBrand is also using copper rods, which leads me to believe their button is likely to be inferior, but I haven’t heard any first hand reports yet.
That’s my $.02.